I'm hosting a good amount of wordpress sites on my server, and it works perfect, the frontend is really fast, because of a good server setup, and a lovely CMS system.
The reason why I'm saying that frontend is fast, is because, since 3.3 released, my customers and new relic account complains about very slow 'external websites' which refers to api.wordpress.org.
What exactly is that used for? Why does it make a request, and is api.wordpress.org running on a CDN network or on a datacenter in US?
I've uploaded a screenshot about the loadtime from the api.wordpress.org and results in: http://slcoding.com/screenshots/WordpressApiLoadTimeNewRelic.png around 9K MS delay, mostly loadtime on the backend (because of the api) the loadtime between pages are 6-7seconds, sometimes more.